18189434 has 8 divisors (see below), whose sum is σ = 27629760. Its totient is φ = 8979516.

The previous prime is 18189433. The next prime is 18189449. The reversal of 18189434 is 43498181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18189433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57404 + ... + 57719.

It is an arithmetic number, because the mean of its divisors is an integer number (3453720).

Almost surely, 2^18189434 is an apocalyptic number.

18189434 is a deficient number, since it is larger than the sum of its proper divisors (9440326).

18189434 is a wasteful number, since it uses less digits than its factorization.

18189434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115204.

The product of its digits is 27648, while the sum is 38.

The square root of 18189434 is about 4264.9072674561. The cubic root of 18189434 is about 262.9902987646.

The spelling of 18189434 in words is "eighteen million, one hundred eighty-nine thousand, four hundred thirty-four".